static.. sounds like background hiss or distortion due to pushing the amplifier too hard or poor quality audio files/equipment.
low volume.. sounds like not enough amplifier output. listen, even the highest quality onboard audio is only equivalent to a $30 soundcard so its not that great just average.
dont go by impedance (ohms) as that tells you nothing. that is not the only factor at place and motherboard audio specs are very highly overrated where they are almost lies at times.
you need an amplifier. i would suggest the schiit magni 2. more than powerful enough and a quality unit. the schiit modi is a nice dac you can pair with it if you wanted but its not required if the dac portion of your onboard is fine and its just the amp portion thats acting up. the audioengine d1 is also nice, but its weaker than the magni. the o2/odac is a good choice too.